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Friendly Fire is the third episode of the fourth season of ER, and the seventy-third episode overall.
Guest Stars: Abraham Benrubi (Jerry), Jorja Fox (Dr. Maggie Doyle), Lisa Nicole Carson (Carla Reese), Caitlin Dulany (Heather Morgan), Danielle Harris (Laura Quentin), Michael Jace (Billy Nelson), Connie Ray (Glenda), Yvette Freeman (Haleh), Ellen Crawford (Lydia), Ted Rooney (Dr. Tabash), John Aylward (Dr. Donald Anspaugh), Mariska Hargitay (Cynthia Hooper), Michael Beach (Al Boulet), Daniel Quinn, Richard Grove, Tim Quill, Tegan West (Construction Owner), Conni Marie Brazelton (Conni), Laura Ceron (Chuny), Deezer D. (Malik), Emily Wagner (Pickman), Monte Russell (Zadro), Brian Lester (Dumar), Meredith Zinner (Chasity Lee), Edward Blanchard (Patient), Tom Chick (Weissbroot), Keon Hall (Jason), Ames Ingham (Kirsten), Dinah Lenney (Shirley), Furley Lumpkin (Dr. Corelli), Derek Montgomery (Clayton), Lenny Rose (Ralph)
Weaver is named the acting chief of the ER; Cynthia Hooper begins her first day as the new desk clerk; Benton gets into a disagreement with Carla over circumcising their infant son; Jeanie's ex-husband, Al is injured in an accident at work and one of his co-worker learn about Al & Jeanie's HIV status; Carol gets jealous when Corday starts flirting with Doug; Jerry accidentally misfires a gun belonging to a patient which damages the hospital parking lot & the entrance to the ER.